Abstract
The experimental dependence of the magnetization on temperature and composition is presented for ${\mathrm{Ga}}_{2\ensuremath{-}x}{\mathrm{Fe}}_{x}{\mathrm{O}}_{3}$. Interpretation is based on a three-sublattice model, giving the $x$ dependence of the iron occupation of the various sites, the variation of the Curie temperature with $x$, and the molecular-field coefficients ${\ensuremath{\lambda}}_{\mathrm{ij}}$. These results permit a dipolar anisotropy calculation of the anisotropy constants as a function of temperature and $x$ in good agreement with experiment. The dipolar contribution to the magnetoelastic energy is also calculated.
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